Local wireless communication system and method employing frequency-variable signal detection

Abstract

A system for performing a local wireless communication using a predetermined frequency band divided into a plurality of channels. The system includes a hub for scanning each channel to identify available one of the plurality of channels and transmitting data over the available channel. The system further includes a sensor set to start to operate when the sensor detects a signal within the predetermined frequency band. The sensor spectrum-senses the signal of the frequency band for each channel, and analyzes a header of packet data for each channel, and receives and processes the packet data if the signal is identified to have a designated code.

Description

[0001]This non-provisional application claims priority under 35 U.S.C. §119(a) on patent application Ser. No. 10-2009-0071528 filed in Republic of Korea on Aug. 4, 2009, the entire contents of which are hereby incorporated by reference.BACKGROUND[0002]1. Technical Field[0003]The present invention is directed to a wireless communication field, and more specifically to a local wireless communication system and method employing frequency-variable signal detection, which may secure a communication channel in a given frequency band by using a spectrum-sensing method.[0004]2. Related Art[0005]In recent years, wireless communication systems have been rapidly grown up owing to the commercialization of mobile telecommunication and technological convergence.[0006]Unlike long-haul telecommunication technologies such as satellite or mobile communications, local wireless access technologies, especially RF / Microwave systems, are different from an image of current simple up / down conversion systems...

AI Technical Summary

Benefits of technology

[0024]According to an aspect of the present invention, there is provided a local wireless communication system and method employing frequency-available signal detection, which may secure an unused channel in a given bandwidth over a local communication network by a sensing method, thereby minimizing interference between channels in an unlicensed frequency band.

[0025]According to another aspect of the present invention, there is provided a local wireless communication system and method employing frequency-available signal detection, in which a sensor node may rapidly detect a received frequency channel in a RF bandwidth, thereby allowing for low-power communications.

[0039]According to an aspect of the present invention, since a hub dynamically may secure a communication frequency channel over a local communication network, interference between channels in an unlicensed frequency band may be minimized.

Problems solved by technology

Second, RF / Analog circuit-related technologies have been rapidly developed for the last twenty years by overcoming problems with current wireless terminals, such as bulky size and large power consumption thanks to the integration technologies.

This project named “PicoRadio” partially enjoyed a success in developing low-power RF devices using MEMS and energy scavenging technology that collects energy from natural sources, however, such a success is still limited in developing a few devices and evaluating the possibility of energy scavenging technology.

It has some demerits like long processing time and high energy consumption.

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